Michael Moss and Henry Fountain contributing reporting.
Janny Scott contributed additional reporting for this article.
David Stout contributed reporting.
David Gonzalez contributed reporting.
David Johnston contributed reporting.
Peter Baker contributed reporting.
Katie Thomas contributed reporting.
Maia de la Baume contributed reporting.
Hwaida Saad and an employee of The New York Times contributed reporting.
John Branch contributed reporting.
John Schwartz contributed reporting from New York.
Charlie Savage contributed reporting from Washington.
Christopher Lehmann-Haupt contributed reporting for this article.
Andrew C. Revkin contributed reporting for this article.
John Branch contributed reporting from Beijing.
Henry Fountain and Liz Robbins contributed reporting from New York.
Michael Cooper contributed reporting from New York.
Joseph Berger contributed reporting from New York.
Elaine Aradillas contributed reporting for this article.
This would be along the lines of the currently used: "X contributed reporting for this article."
